A smartwatch designed to help keep wearers fit and healthy is causing more harm than good, according to some users.

A string of Samsung Gear Fit2 wearers have come forward to complain of burn-like marks left on their arms - and some have been left with permanent scars.

They have suggested that this could be caused by the device overheating, while others speculate that an allergic reaction or contact with water might be to blame.

But so far, the exact cause has remained a mystery.

Samsung customers have been speculating about mysterious marks which have appeared after wearing the Gear Fit2 smart watch. Samsung communities forum user MindyW (pictured) is just one of the many people claiming to have been left with a burn-like scar

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'I'm a nurse so I self-treated myself. I doubt very highly these are allergies.

'This seems to be an issue that might need to looked into since more situations like this are occurring.'

Another user said they had experienced the same issue after their daughter bought them the watch as a Mother's Day gift.

Posting under the name usermZi4ZplJDH, they said: 'I have the same issue, my daughter got me the Gear Fit 2 last year for mothers day because it is water resistant and I walk laps in the pool for exercise.

User MindyW reported that she received burns from her Gear fit 2 after getting it wet

Another user said they had experienced the same issue after their daughter bought them the watch as a mother's day gift

Yet another user 'Morwen' claimed that the company had told them that the fault was the result of overheating

'I wore it for about two weeks then felt like an acid burn on the outside of my wrist.

'Moved to the right arm, same thing.

'I didn't return because for my daughter it was very expensive so it sits in the drawer. Very sad because I really liked it.'

The Gear Fit2 (pictured) is designed to help keep wearers fit and healthy, but for some it is causing more harm than good

Yet another user 'Morwen' claimed that the company had told them that the fault was the result of overheating.

They added: 'I ended up sending my Gear Fit2 to Samsung and they replaced a part they said was overheating.